linux-kernel - Re: [PATCH] KVM: explicitly set rmap_head->val to 0 in pte_list_desc_remove

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Date:   Thu, 5 Dec 2019 11:19:33 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linmiaohe <linmiaohe@...wei.com>, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] KVM: explicitly set rmap_head->val to 0 in
 pte_list_desc_remove_entry()

On 05/12/19 04:40, linmiaohe wrote:
> From: Miaohe Lin <linmiaohe@...wei.com>
> 
> When we reach here, we have desc->sptes[j] = NULL with j = 0.
> So we can replace desc->sptes[0] with 0 to make it more clear.
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  arch/x86/kvm/mmu/mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 6f92b40d798c..a81c605abbba 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -1410,7 +1410,7 @@ pte_list_desc_remove_entry(struct kvm_rmap_head *rmap_head,
>  	if (j != 0)
>  		return;
>  	if (!prev_desc && !desc->more)
> -		rmap_head->val = (unsigned long)desc->sptes[0];
> +		rmap_head->val = 0;
>  	else
>  		if (prev_desc)
>  			prev_desc->more = desc->more;
> 

Queued, thanks.

Paolo